Hello,
For a small project, I need to keep current inversely related to a photoconductor's conductivity. In other words, current can flow in the circuit when the photoconductor is *not* conducting. Note that the voltage and current is coming from a different part of the circuit, like a capacitor or battery. My last plan was to connect a zener diode to it so that when the current is high enough, the diode would reverse it's permitted direction of flow and therefore stop the current. When light is not shining on the photoconductor, it resists enough to drop the current below the level of the breakdown current.
Then I found out that zener diodes work via voltage, not current. So I still need to find a way. I understand it's possible by using a couple of transistors, but I'm not sure how. So, how would I go about either A) using transistors to solve my problem, or B) using another way?
Thanks, Bill